It's Jorge Mendes. He'll be kissing the badge at Old Trafford before the month is out.
It's Mendes, he will go where the money is. The exact same situation played out last season with Yoro, Yoro wanted Madrid, Madrid wanted him, United paid over the odds, that's where he ended up.
This comes down to cash, West Ham will not accept 5M less from anyone because the player has a favorite, they simply aren't in a position to do so. I think you might even get away with less than expected if you paid more upfront and before June 30th.
